Casing for metallic packing for piston-rods.



Patentad Jan. 29, I90l.

F. E. SMALL. CASING FOR METALLIC PACKING FOR PISTON RODS:

(Application filed Nov. 20, 1900'.) (No Model.)

. liwenior: Frederick E'mall,

Witnesses:

Z MW /76 M,

UNITED TATES Aer Fries.

FREDERICK E. SMALL, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE- I-IALF TO WILLIAM B. MERRILL, OF SAME PLACE.

CASING FOR METALLIC PACKING FOR PISTON-RODS.

SPECIFICATION forming part of Letters Patent No. 666,889, dated January 29, 1901.

Application filed November 20, 1900- Serial No. 37,102. (No model.)

To ail whom it may concern;

Be it known that 1, FREDERIOK E. SMALL, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Casings for Metallic Packings for Piston-Rods and Like Articles, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to casings for metallic packings for piston-rods and like articles; and it consists in certain novel features of construction, arrangement, and combination of parts, which will be readily understood by reference to the description of the accompanying drawings and to the claims hereto appended and in which my invention is clearly pointed out.

Figure 1 of the drawings is an end view of a casing made in two sections divided longitudinally and embodying my invention. Fig. 2 is an exterior elevation of the same looking in the direction of the line of division between the two sections. Fig. 3 is an inside elevation of one of the sections of said casing. Fig. 4 is a sectional elevation of the same section, the cutting plane being on line A B on Fig. 3. Fig. 5 is an inside elevation of the other section shown in an inverted position; and Fig. 6 is a sectional elevation of the same section, the cutting plane being on line C D on Fig. 5.

In the drawings, 1 and 2 represent the two sections of a cylindrical casing, each provided with flanges 3, 4, and 5 and firmly secured together by the bolts 6, as shown. The lower end portion of each section has a semicircular opening 7 to fit around the pistonrod or other article to be moved endwise through said casing, and each section has formed therein a seinicylindrical chamber 8 of a diameter considerably greater than the diameter of the opening 7, said chamber be ing provided at its upper end with the shallow inwardly-projecting semi-annular lip 9.

In the chamber 8, between the lip 9 and the seat 10, is placed the metallic packing, (not shown,) which may be of any well-known construction and especially of the constructions shown and described in Letters Patent No. 490,050, granted January 17, 1893, and No. 642,855, granted February 6, 1900.

The cont-acting surfaces of the two sections of the casing are scraped or ground to form a steam-tight joint, and the seat 10, upon which the metallic packing rests, is also scraped or ground to a perfectly level surface, and it is very essential that the two sections of the casing should be so secured together that the seat-surfaces 10 should exactly coincide not only when first put together, but when later on they are separated and then put together again, because the slightest variation of the levels of the surfaces 10 in the two sections of the casing will cause a leakage of steam. To insure perfect coincidence of the said surfaces 10 10 at all times is the object of my invention, and to this end I form in the contacting surfaces of each of the two sections of the casing a rectangular groove 11 on each side of the semicircular opening 7 and extending from said opening 7 to the periphery of the casing at right angles to the axis of the casing. Keys or tongues 12, rectangular in cross-section, are secured in fixed positions in the grooves in one of the casing-sections and project onehalf their width beyond the contacting face of said section, as shown in Fig. 6, said pro jecting portions of said keys fitting tightly in the grooves 11, formed in the other section, when the two sections are put together.

In constructing the casing the contacting faces of the two sections 1 and 2 of the casing are planed to level surfaces and scraped or ground to a perfect fit. The grooves 11 are formed in both sections, the grooves in one section being slightly narrower than the grooves in the other section. The keys 12, having rectangular cross-sections, are then driven edgewise into the narrower grooves 11, so as to be permanetly secured therein. The two sections 1 and 2 are then placed together with the portions of the keys 12, which project beyond the face of the section in which they are fixed, fitting closely in the grooves 11 in the other section, and said two sections are then firmly bolted together by the bolts 6,after which the exterior and interior surfaces of the casing are finished to the desired diame- ICO ters and true surfaces. done, the two sections maybe separated and then put together again, inclosing the metallic packing fitted to and placed in position about the piston-rod or other like article to be operated therein without disturbing the relative positions of the two surfaces 10.

Instead of forming grooves in both sections of the casing the grooves 11 may be formed in only one section, as shown in Figs. 3 and 4, and instead of the detachable keys 12 a corresponding tongue may be formed in one piece with the other section of the casing and have the same cross-section as the projecting portion of the key 12, (shown in Figs. 5 and 6,) said tongue being adapted to enter and fit the groove 11 in the same manner as the key 12 and to serve the same purpose.

\Vhat I claim as new, and desire to secure by Letters Patent of the United States, is

1. A packi ng-casing for piston-rods or other like operating rods, comprising two substantially equal sections, divided axially, and constructed and arranged to inclose said rod and the packing therefor, and each having formed in its contacting face a rectangular groove extending entirely across said contacting face, at right angles to the axis of said casing, in combination with rectangular keys fitted to said grooves and extending across the joint between said sections of the casing, to accu- When this has been I rately register said two casing-sections rela tive to each other in a longitudinal direction.

2. In an axially-divided casing for metallic packings for piston-rods, or other like operating rods, the combination of the two sections of said casing provided in their contacting faces with rectangular grooves extending outwardly from the opening for the passage of the piston or other rod, to the periphery of said casing; and rectangular keys firmly fixed in the grooves in one of the sections of said casing and fitting closely in the grooves in the other of said sections when the two sections are firmly bolted together.

3. Acasing for metallic packings for piston and other like rods, divided axially into two substantially equal parts, firmly bolted together and accurately registered longitudinally, relatively to each other, by tongues and grooves arranged at right angles to the axis of said casing, said tongues and grooves having rectangular cross-sections and engagin; each other.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 19th day of November, A. D. 1900.

FREDERICK E. SMALL.

Vitnesses:

N. C. LOMBARD, JEROME A. BACON. 

